Better performing Merlin 66 and 70 Mk IXs in early 1943 would have squared off against G4's, which had exact same performance as G2.
Of course top speed doesn't make a plane better, we have to look at all of its capabilites. Mk IX had twice the firepower of the 'clean' G2, had higher ceiling, smaller turn radius and shorter turn times (by about 2 seconds, which ain't much). Climb rate was very similar, and the 109G2 had quicker initial dive. MkIX had better visibility form the cockpit and lighter controls during high speed pullouts.
I think the G2 was as close a match for the Mk IX as the 109E was for the Mk1, but to say it was better would be ignoring too many factors.